.back_head{
	width:80%;
	padding: 0 10%; 
}

.back_header_left{
	float:left;
	height:80px;
	width:40%;
}

.back_header_right{
	float:right;
	width:40%; 
	line-height:20px;
	text-align:right;
}

.back_current_user{
	text-decoration:underline;
}

.back_exit{
	color:red;
	cursor:pointer;
	text-decoration:none;
}

#back_curent_time{
	height:25px;
	line-height:25px;
}

.p-style{
	height:40px;
}